T-C模型中虚光子过程对光场压缩效应的影响

Influences of the virtual photon process on the squeezing effects of a single-mode light field in the T-C model

利用全量子理论 ,研究非旋波近似下T C模型中受激场的压缩效应 .结果表明 :非旋波近似下 ,由于虚光场的影响 ,Q的演化曲线出现了“小锯齿状” ,表现为系统的量子噪声 ,随着ω和 n的增大 ,量子噪声分别减小和增大 ,虚光子过程使光场的压缩程度明显加深 ;研究结果还揭示了原子 场耦合系数λ及原子间耦合系数g与光场压缩效应的关系 .

In this paper, the squeezing effects of a light field in the T-C model is studied by means of the quantum theory in the Counter-Rotating-Wave-Approximation (C-RWA). It has been shown that: the little indentation which represents the quantum noise of the system appears in the evolution curves of Q under the C-RWA; the quantum noise which is caused by virtual photon field gradually becomes weak when omega increases; the quantum noise increases when n increases; the virtual photon process can strengthen the squeezing effect obviously. Besides, the dependence of the atom-field coupling constant lambda and the atom-atom coupling constant g on the squeezing effects of the field is observed in our results.